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/* Copyright (c) 1998 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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/* |
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* OpenGL GLX driver for holodeck display. |
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* Based on old GLX driver using cones. |
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#include "standard.h" |
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#include <sys/types.h> |
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#include <GL/glx.h> |
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#include <GL/glu.h> |
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#ifdef STEREO |
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#define MOVORB(s) ((s)&ShiftMask ? 1 : (s)&ControlMask ? -1 : 0) |
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#ifndef TARGETFPS |
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#define TARGETFPS 4.0 /* target frames/sec during motion */ |
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#define TARGETFPS 2.0 /* target frames/sec during motion */ |
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#endif |
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#define MINWIDTH 480 /* minimum graphics window width */ |
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#ifdef STEREO |
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static int pushright(), popright(); |
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#endif |
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static double getdistance(); |
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#define mapdepth(d) ((d)> 0.9995 ? FHUGE: dev_zmin/ \ |
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(1.-(d)*(1.-dev_zmin/dev_zmax))) |
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extern time_t time(); |
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setstereobuf(STEREO_BUFFER_LEFT); |
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#endif |
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checkglerr("setting rendering parameters"); |
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copystruct(&odev.v, &stdview); |
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odev.v = stdview; |
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odev.v.type = VT_PER; |
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/* map the window */ |
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XMapWindow(ourdisplay, gwind); |
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dev_clear() /* clear our representation */ |
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{ |
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smInit(rsL.max_samp); |
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wipeclean(); |
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wipeclean(1); |
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rayqleft = 0; /* hold off update */ |
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} |
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XResizeWindow(ourdisplay, gwind, odev.hres, odev.vres); |
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dev_input(); /* get resize event */ |
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} |
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copystruct(&odev.v, nv); /* setview() already called */ |
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odev.v = *nv; /* setview() already called */ |
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} |
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#ifdef STEREO |
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copystruct(&vwright, nv); |
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d = eyesepdist / sqrt(nv->hn2); |
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VSUM(vwright.vp, nv->vp, nv->hvec, d); |
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/* setview(&vwright); -- Unnecessary */ |
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vwright = *nv; |
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d = eyesepdist / sqrt(nv->hn2); |
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VSUM(vwright.vp, nv->vp, nv->hvec, d); |
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/* setview(&vwright); -- Unnecessary */ |
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#endif |
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} |
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wipeclean(); |
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wipeclean(0); |
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return(1); |
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} |
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dev_section(gfn, pfn) /* add octree for geometry rendering */ |
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char *gfn, *pfn; |
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{ |
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/* unimplemented */ |
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} |
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dev_auxcom(cmd, args) /* process an auxiliary command */ |
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char *cmd, *args; |
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{ |
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if (mapped) { |
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#ifdef STEREO |
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pushright(); /* update right eye */ |
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smUpdate(&vwright, 100); |
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smUpdate(&vwright, MAXQUALITY); |
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#ifdef DOBJ |
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dobj_render(); /* usually in foreground */ |
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#endif |
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popright(); /* update left eye */ |
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#endif |
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smUpdate(&odev.v, 100); |
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smUpdate(&odev.v, MAXQUALITY); |
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checkglerr("rendering mesh"); |
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#ifdef DOBJ |
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dobj_render(); |
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checkglerr("drawing grid lines"); |
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} |
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static double |
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getdistance(dx, dy, direc) /* distance from fore plane along view ray */ |
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int dx, dy; |
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FVECT direc; |
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{ |
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GLfloat gldepth; |
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double dist; |
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if (dx<0 | dx>=odev.hres | dy<0 | dy>=odev.vres) |
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return(FHUGE); |
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glReadPixels(dx,dy, 1,1, GL_DEPTH_COMPONENT,GL_FLOAT, &gldepth); |
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if (gldepth <= FTINY) |
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return (FHUGE); /* call failed */ |
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dist = mapdepth(gldepth); |
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if (dist >= .99*FHUGE) |
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return(FHUGE); |
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return((dist-odev.v.vfore)/DOT(direc,odev.v.vdir)); |
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} |
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static |
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moveview(dx, dy, mov, orb) /* move our view */ |
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int dx, dy, mov, orb; |
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{ |
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VIEW nv; |
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FVECT odir, v1, wip; |
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double d; |
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double d,d1; |
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register int li; |
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/* start with old view */ |
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copystruct(&nv, &odev.v); |
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nv = odev.v; |
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/* orient our motion */ |
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if (viewray(v1, odir, &odev.v, |
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(dx+.5)/odev.hres, (dy+.5)/odev.vres) < -FTINY) |
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return(0); /* outside view */ |
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if (mov | orb) { /* moving relative to geometry */ |
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d = getdistance(dx, dy, odir);/*distance from front plane */ |
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#ifdef DOBJ |
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d = dobj_trace(NULL, v1, odir); /* check objects */ |
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d1 = dobj_trace(NULL, v1, odir); /* check objects */ |
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/* check holodeck */ |
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if ((li = smFindSamp(v1, odir)) >= 0) { |
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VCOPY(wip, rsL.wp[li]); |
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if (d < .99*FHUGE && d*d <= dist2(v1, wip)) |
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li = -1; /* object is closer */ |
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} else if (d >= .99*FHUGE) |
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return(0); /* nothing visible */ |
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if (li < 0) |
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VSUM(wip, v1, odir, d); /* else get object point */ |
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#else |
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if ((li = smFindSamp(v1, odir)) < 0) |
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return(0); /* not on window */ |
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VCOPY(wip, rsL.wp[li]); |
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if (d1 < d) |
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d = d1; |
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#endif |
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#ifdef DEBUG |
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if (d >= .99*FHUGE) |
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d = 0.5*(dev_zmax+dev_zmin); /* just guess */ |
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VSUM(wip, v1, odir, d); |
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VSUB(odir, wip, odev.v.vp); |
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#if 0 |
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fprintf(stderr, "moveview: hit %s at (%f,%f,%f) (t=%f)\n", |
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li < 0 ? "object" : "mesh", |
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wip[0], wip[1], wip[2], |
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(wip[1]-odev.v.vp[1])*odir[1] + |
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(wip[2]-odev.v.vp[2])*odir[2]); |
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#endif |
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VSUM(odir, wip, odev.v.vp, -1.); |
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} else /* panning with constant viewpoint */ |
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VCOPY(nv.vdir, odir); |
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if (orb && mov) { /* orbit left/right */ |
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{ |
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int movdir = MOVDIR(ebut->button); |
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int movorb = MOVORB(ebut->state); |
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int qlevel = 99; |
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int qlevel = MAXQUALITY-1; |
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time_t lasttime, thistime; |
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int nframes; |
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Window rootw, childw; |
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XNoOp(ourdisplay); /* makes sure we're not idle */ |
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lasttime = time(0); nframes = 0; |
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nframes = 0; |
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while (!XCheckMaskEvent(ourdisplay, |
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ButtonReleaseMask, levptr(XEvent))) { |
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/* get cursor position */ |
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dobj_render(); /* redraw object */ |
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#endif |
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glFlush(); |
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nframes++; /* figure out good quality level */ |
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/* figure out good quality level */ |
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if (!nframes++) { /* ignore first frame */ |
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lasttime = time(0); |
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continue; |
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} |
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thistime = time(0); |
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if (thistime - lasttime >= 3 || |
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if (thistime - lasttime >= 6 || |
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nframes > (int)(3*3*TARGETFPS)) { |
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qlevel = thistime<=lasttime ? 1000 : |
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qlevel = thistime<=lasttime ? 3*MAXQUALITY : |
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(int)((double)nframes/(thistime-lasttime) |
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/ TARGETFPS * qlevel + 0.5); |
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lasttime = thistime; nframes = 0; |
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if (qlevel > 99) { |
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if (qlevel > 300) { /* put on the brakes */ |
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nframes = 0; |
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if (qlevel >= MAXQUALITY) { |
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if (qlevel >= 3*MAXQUALITY) { /* brakes!! */ |
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sleep(1); |
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lasttime++; |
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} |
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qlevel = 99; |
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qlevel = MAXQUALITY-1; |
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} else if (qlevel < 1) |
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qlevel = 1; |
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} |
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double d, xmin, xmax, ymin, ymax; |
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if (mindpth >= maxdpth) { |
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dev_zmin = 0.1; |
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dev_zmin = 1.; |
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dev_zmax = 100.; |
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} else { |
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dev_zmin = 0.5*mindpth; |
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dev_zmax = 1.5*maxdpth; |
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if (dev_zmin > dev_zmax/100.) |
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dev_zmin = dev_zmax/100.; |
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dev_zmin = 0.1*mindpth; |
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dev_zmax = 5.0*maxdpth; |
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} |
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if (odev.v.vfore > FTINY) |
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dev_zmin = odev.v.vfore; |
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if (odev.v.vaft > FTINY) |
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dev_zmax = odev.v.vaft; |
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if (dev_zmin < dev_zmax/5000.) |
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dev_zmin = dev_zmax/5000.; |
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if (dev_zmin*500. < dev_zmax) |
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dev_zmax = dev_zmin*500.; |
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xmax = dev_zmin * tan(PI/180./2. * odev.v.horiz); |
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xmin = -xmax; |
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d = odev.v.hoff * (xmax - xmin); |
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static |
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wipeclean() /* prepare for redraw */ |
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wipeclean(tmflag) /* prepare for redraw */ |
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int tmflag; |
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{ |
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/* clear depth buffer */ |
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#ifdef STEREO |
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setstereobuf(STEREO_BUFFER_LEFT); |
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#endif |
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glClear(GL_DEPTH_BUFFER_BIT); |
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smClean(); /* reset drawing routines */ |
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smClean(tmflag); /* reset drawing routines */ |
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setglpersp(&odev.v); /* reset view & clipping planes */ |
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} |
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inpresflags |= DFL(DC_RESUME); |
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return; |
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case CTRL('R'): /* redraw screen */ |
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wipeclean(); |
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wipeclean(1); |
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return; |
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case CTRL('L'): /* refresh from server */ |
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if (inpresflags & DFL(DC_REDRAW)) |
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} |
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if (eexp->count) /* wait for final exposure */ |
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return; |
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wipeclean(); /* clear depth */ |
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wipeclean(0); /* clear depth */ |
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} |
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